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MedTerms Medical Dictionary

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Na (sodium): Na is the chemical symbol for sodium. From natrium, a synonym for sodium.

Sodium is the major positive ion (cation) in fluid outside of cells. The chemical notation for sodium is Na⁺. When combined with chloride (Cl), the resulting substance is table salt (NaCl).

Excess sodium (such as from fast food hamburger and fries) is excreted in the urine. Too much or too little sodium can cause cells to malfunction, and extremes can be fatal.

Normal blood sodium level is 135 - 145 milliEquivalents/liter (mEq/L), or in international units, 135 - 145 millimoles/liter (mmol/L).

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Information in the MedTerms Medical Dictionary is provided for informational purposes only and is not a substitute for professional medical advice. You should not use this information for diagnosing or treating a medical or health condition. You should carefully read all product packaging. If you have or suspect you have a medical problem, promptly contact your professional healthcare provider.

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